我想在我的Java卡上签署一些数据(消息字节数组),然后在响应APDU中返回签名。我的代码工作正常(或者至少我认为确实如此,并且它返回9000),而没有行 apdu.sendbytes(bas,ssignlen),但是当我删除时,我会得到一个未知错误(0xc000002b(未知错误。))。
当我尝试在响应中发送其他数据时,它可以完美地工作。
apdu.setIncomingAndReceive();
Util.arrayCopyNonAtomic(MESSAGE, (short) 0, buffer, (short) 0, (short) MESSAGE.length);
apdu.setOutgoingAndSend((short) 0, (short) MESSAGE.length);
这是我的代码。我在做什么错或失踪?谢谢!
public class TestApplet extends Applet {
...
private final static byte SIGN = (byte) 0x01;
...
private final static byte[] MESSAGE = new byte[] { 'M', 'e', 's', 's', 'a', 'g', 'e' };
final static short BAS = 0;
public void process(APDU apdu) {
if (this.selectingApplet())
return;
byte buffer[] = apdu.getBuffer();
...
switch (buffer[ISO7816.OFFSET_INS]) {
case SIGN:
try {
ECDSAKeyPair = Secp256k1Domain.getKeyPairParameter();
ECDSAKeyPair.genKeyPair();
ECDSAPublicKey = (ECPublicKey) ECDSAKeyPair.getPublic();
ECDSAPrivateKey = (ECPrivateKey) ECDSAKeyPair.getPrivate();
ECDSASignature = Signature.getInstance(Signature.ALG_ECDSA_SHA, false);
short signLen = 0;
byte[] signatureArray = new byte[70];
ECDSASignature.init(ECDSAPrivateKey, Signature.MODE_SIGN);
signLen = ECDSASignature.sign(MESSAGE, BAS, (short) MESSAGE.length, signatureArray, BAS);
apdu.setIncomingAndReceive();
Util.arrayCopyNonAtomic(signatureArray, (short) 0, buffer, (short) 0, (short) signatureArray.length);
apdu.setOutgoingAndSend((short) 0, (short) signatureArray.length);
} catch (CryptoException c) {
short reason = c.getReason();
ISOException.throwIt((short) ((short) (0x9C00) | reason));
}
break;
...
return;
}
}
可能是signLen
大于NE值(在Javacard规范中错误地称为Le
)。顺便说一句,您还滥用Le
值表示(short) MESSAGE.length
。NE表示预计将发送回的字节的最大数量。